Using the Conversion Factor

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Using the Conversion Factor

• Objective Make unit conversions

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Fill in the Missing Numbers
12
1 foot _____ inches 1 meter _____
centimeters 1 pound _______ ounces 1 minute
______ seconds 1 hour ________ minutes 1 day
__________ seconds
100
16
60
60
86,400
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Unit conversion factor
A unit conversion factor is a fraction whose
numerator and denominator are equivalent
measures. Some common unit conversion factors
are given below. You can also use the reciprocal
of these.
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Unit conversion factor
A unit conversion factor is a fraction whose
numerator and denominator are equivalent
measures. Some common unit conversion factors
are given below. You can also use the reciprocal
of these.
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Choose a unit conversion factor that

• Introduces the unit you want in the answer
• Cancels out the original unit so that the one you
  want is all that is left.

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Canceling out Words
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Practice Choose the appropriate conversion
factor.
Inches to feet
Minutes to hours
Meters to centimeters
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Convert 8 yards to feet
Make a decision What conversion factor will you
use?
Set up the problem Multiply the measurement by
the conversion factor.
Hint! Use the one that will cancel out the units
you want to change
Solve the problem Perform the multiplication
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A bucket holds 16 quarts. How many gallons of
water will fill the bucket? Use a unit
conversion factor to convert the units.
What are the two conversion factors comparing
quarts and gallons?
Which one will cancel quarts?
16 qt ?
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You Try it!
One bag of apples weighs 64 ounces. How many
pounds does it weigh?
Darren drank 2 liters of water. How many
milliliters of water did he drink?
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Making Rate Conversions

• Use a unit conversion to convert the units within
  each rate

12
Convert 80 miles per hour to feet per hour.
Convert 63,360 feet per hour to miles per hour.
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You Try it!
Convert 32 feet per second to inches per second.
A craft store charges 1.75 per foot for lace.
How much per yard is this?
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Word Problems
The average American eats 23 pounds of pizza per
year. Find the number of ounces the average
American eats per year.
The average American eats 368 ounces of pizza per
year.
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General Math click here
Pre-Algebra click here
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General Math Homework
Do Practice worksheet for tomorrow.
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Word Problems
A car traveled 60 miles on a road in 2 hours.
How many feet per second was the car traveling?
Hint Set up the words first.
How many seconds in an hour?
The car traveled 44 feet per second.
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Homework ?
Complete Practice Worksheet B